[R] data frame manipulation and regex

[arnaud Gaboury]

Dear group,

Here is my data.frame :


avprix <-
structure(list(DESCRIPTION = c("CORN Jul/10", "CORN May/10", 
"ROBUSTA COFFEE (10) Jul/10", "SOYBEANS Jul/10", "SPCL HIGH GRADE ZINC USD
Jul/10", 
"STANDARD LEAD USD Jul/10"), prix = c(-1.5, -1082, 11084, 1983.5, 
-2464, -118), quantity = c(0, -3, 8, 2, -1, 0)), .Names = c("DESCRIPTION", 
"prix", "quantity"), row.names = c(NA, -6L), class = "data.frame")

> avprix
                      DESCRIPTION    prix quantity
1                     CORN Jul/10    -1.5        0
2                     CORN May/10 -1082.0       -3
3      ROBUSTA COFFEE (10) Jul/10 11084.0        8
4                 SOYBEANS Jul/10  1983.5        2
5 SPCL HIGH GRADE ZINC USD Jul/10 -2464.0       -1
6        STANDARD LEAD USD Jul/10  -118.0        0

I need to remove the date (i.e. Jul/10 in this example) for each element of
the DESCRIPTION column that contains the USD symbol. I am trying to do this
using regular expressions, but must admit I am going nowhere.
My elements in the DESCRIPTION column and the dates can change every day.

TY for any help.